Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..941m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 15, 1989, p. 941-949.
Astronomy and Astrophysics
Astrophysics
32
Accretion Disks, Binary Stars, Magnetic Stars, Variable Stars, White Dwarf Stars, Balmer Series, Emission Spectra, Polarimetry, Stellar Magnetic Fields, Stellar Mass Accretion, Stellar Spectrophotometry
Scientific paper
New, high-quality, phase-resolved spectroscopy of the erratic magnetic binary H0538+608 is presented, and individual emission-line regions in the binary system are located. A rotational period for the magnetic white dwarf primary of 3.331 + or - 0.015 hr is derived. The strong Balmer lines of the optical spectrum are each resolved into four components, including the normal broad and narrow components as well as high-velocity and an asymmetric component. Combined analysis of the polarimetry and spectroscopy suggests a model in which two accretion spots contribute oppositely polarized cyclotron emission in various proportions and at various times. Short-term changes in the mass transfer rate may cause changes in the threading location and thereby affect the geometry of accretion onto these two poles.
Liebert James
Mason Paul A.
Schmidt Gary D.
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